<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>函数的定义与调用</title>
</head>

<body>
    <script>
        function getSum() {
            var sum = 0;
            for (var i = 1; i <= 100; i++) {
                sum = sum + i;
            }
            return sum;
        }
        document.write('1到100个数相加和是：' + getSum())
    </script>
</body>

</html>